PSS ID Number: 157247
Article Last Modified on 7/9/2000
The information in this article applies to:
- Microsoft Win32 Software Development Kit (SDK)
This article was previously published under Q157247
SYMPTOMS
Calling IShellFolder::CreateViewObject() for a file system folder causes
an Access Violation.
CAUSE
Using the file system implementation of IShellFolder::CreateViewObject()
results in the shell sending a yet-to-be documented message, the
WM_GETISHELLBROWSER message (currently WM_USER+7) to the hWndOwner. The
shell assumes the HWND passed in as the owner responds properly to the
WM_GETISHELLBROWSER message. If it doesn't, there is an access violation in
Shell32.DLL.
RESOLUTION
The shell expects that the hWndOwner will supply the IShellBrowser
interface to it in response to the WM_GETISHELLBROWSER message.
For example, if your window is a dialog, the following snippet of code
would respond correctly to the message.
...
#ifndef WM_GETISHELLBROWSER
#define WM_GETISHELLBROWSER (WM_USER+7)
#endif
...
IShellBrowser *m_psb;
...
BOOL DialogProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch(uMsg)
{
...
case WM_GETISHELLBROWSER:
SetWindowLong(hDlg, DWL_MSGRESULT, (LONG)m_psb);
break;
...
STATUS
Microsoft has confirmed this to be a problem in the products listed at the
beginning of this article.
Keywords: kbExtension kbNameSpace kbprb KB157247
Technology: kbAudDeveloper kbSDKSearch kbWin32SDKSearch kbWin32sSearch